1Assistant Professor, Department of Fish Health and Environment, College of Fisheries, Central Agricultural University, Lembucherra, Post Box No. 60, Agartala - 799 001, Tripura, India
2Associate Professor & Head, Department of Fish Health and Environment, College of Fisheries, Central Agricultural University, Lembucherra, Post Box No. 60, Agartala - 799 001, Tripura, India
3Post Graduate Scholar, Division of Aquaculture, Central Institute of Fisheries Education (Deemed University), Mumbai-400061, Maharashtra, India
*Email id: ratankumarsaha123@rediffmail.com
Occurrence and pathology of monogenetic gill parasites were studied with an objective to find out any relation between some physiological parameters and monogeneans infection in Indian major carp, rohu (Labeo rohita) in farmed condition. Sampling of water and fish was done fortnightly for about 6 months from three monogenean infested ponds designated as pond- A, B and C. Among different monogeneans, Dactylogyrus sp. and Gyrodactylus sp. were identified. Both plasma immunoglobulin and total plasma protein showed significant negative correlation (P<0.01) with monogenean intensity and prevalence indicating an immunosuppressive condition following monogenean infestation. Different forms of histopathological changes of gill, namely hypertrophy, telangiectasis, gill degeneration, coalescence, hyperplasia (Grade I, II, III and IV), were prominent. In conclusion, the study reveals that both hyperplasia and immunity helps the rohu to eradicate monogeneans from their gills but our hypothesis must be regarded as speculative as long as further detail study is not carried out.
Monogeneans, gill, total plasma protein, total immunoglobulin, histopathology, rohu
